Room-temperature Continuous-Wave Upconversion White Microlaser Using a Rare-earth-Doped Microcavity
Bo Jiang, Song Zhu, Wenyu Wang, Jin Li, Chun‐Hua Dong, Lei Shi, Xinliang Zhang
Abstract
White laser covering the visible color spectrum is critical in various applications including vivid display, holographic imaging, and light-based version of Wi-Fi, but it is still challenging to realize a white microlaser due to the rigorous requirement for the balance between the optical gain and feedback in a wide wavelength range. Here, we employ thulium, erbium, and ytterbium elements corporately for the upconversion white lasing by an individual ultrahigh-quality (Q) (up to 108) doped microcavity with microwatt thresholds for the red, green, and blue lasers. To the best of our knowledge, it is the first rare-earth-element-based room-temperature continuous-wave white microlaser. This microlaser also exhibits relatively stable chromaticity over 180 min, which makes it possible for practical applications.